Extrusion for use in the construction of a window



FIG. 1 is a perspective view of an extrusion for use in the construction of a window showing my new design, the extrusion being broken in the center to indicate indeterminate length; and,

FIG. 2 is an end elevational view thereof. 

The ornamental design for an extrusion for use in the construction of a window, as shown and described. 